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Method for preparing polyurethane-polyurea coated fertilizer

A polyurethane polyurea and coating technology, applied in fertilizer forms, fertilizer mixtures, fertilization devices, etc., can solve the problems of unsatisfactory controlled release effect, prone to pinholes and cracks, and complicated implementation process, so as to reduce leaching. Loss, good physical properties, wide range of raw material effects

Inactive Publication Date: 2012-06-27
晋盾防护(山西)科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the coating materials used at home and abroad have many defects such as poor film elasticity, brittleness, prone to pinholes and cracks after coating, poor wear resistance, complicated implementation process, high cost or unsatisfactory controlled release effect, etc. Moreover, during the packaging, storage, transportation and batching process of fertilizer granules, the film is easily damaged due to friction and collision, and the expected sufficient controlled release cannot be achieved.

Method used

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  • Method for preparing polyurethane-polyurea coated fertilizer
  • Method for preparing polyurethane-polyurea coated fertilizer
  • Method for preparing polyurethane-polyurea coated fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Put 500g of polyoxypropylene glycol with a molecular weight of 1000 into a reactor equipped with a stirrer, a thermometer and a vacuum connecting pipe, and stir and heat, and then dehydrate for 3 hours at a vacuum degree of 0.08MPa and a temperature of 120°C. After cooling to 50°C, 204.5 g of toluene diisocyanate T-80 was added, the temperature was raised, and the reaction was carried out at 70°C. When the NCO mass fraction reaches 8.05%, vacuum degassing at 0.08 MPa for 15 minutes, and then the prepolymer is reduced to room temperature for use.

[0045] The impingement mixed spray method is used to coat the fertilizer. In the spray drying equipment, the fertilizer is heated to 60°C, the fan frequency is set to 45Hz, the nozzle atomization air pressure is 1.1Mpa, the inlet temperature is 65°C, and the spraying speed is 0.4Kg / h. The above-mentioned prepolymer and the chain extender diethyltoluenediamine E-100 enter the spray gun to impinge and mix in a mass ratio of 7.7:1, ...

Embodiment 2

[0047] Put 500g of polyoxypropylene glycol with a molecular weight of 2000 into a reactor equipped with a stirrer, a thermometer and a vacuum connecting pipe, and stir and heat, and dehydrate for 2.5h at a vacuum degree of 0.085MPa and a temperature of 110°C. After cooling down to 45°C, 26.3g epoxy resin E-44 was added and quickly stirred for 30 minutes, and 140.5g toluene diisocyanate T-80 was added, and the temperature was raised to 80°C for reaction. When the NCO mass fraction reaches 7%, vacuum degassing at 0.085 MPa for 15 minutes, and then the prepolymer is reduced to room temperature for use.

[0048] The impingement mixed spray method is used to coat the fertilizer. In the spray drying equipment, the fertilizer is heated to 60℃, the fan frequency is 45Hz, the nozzle atomization air pressure is 1.0Mpa, the inlet temperature is 70℃, and the spraying speed is 0.5Kg / h. The above-mentioned prepolymer and the chain extender diethyltoluenediamine E-100 enter the spray gun to imp...

Embodiment 3

[0050] Put 500g of polyoxypropylene glycol with a molecular weight of 1000 into a reactor equipped with a stirrer, a thermometer and a vacuum connecting pipe, and stir and heat, and dehydrate for 2h at a vacuum degree of 0.09MPa and a temperature of 100°C. After cooling down to 40°C, 42.2g starch was added, stirred quickly for 60min, and then 203.5g toluene diisocyanate T-80 was added, and the temperature was raised to 85°C for reaction. When the NCO mass fraction reaches 7.5%, vacuum degassing at 0.09 MPa for 15 minutes, and then the prepolymer is cooled to room temperature for use.

[0051] The impingement mixed spray method is used to coat the fertilizer. In the spray drying equipment, the fertilizer is heated to 60°C, the fan frequency is set to 45Hz, the nozzle atomization air pressure is 0.8Mpa, the inlet temperature is 75°C, and the spraying speed is 0.6Kg / h. The above-mentioned prepolymer and the chain extender diethyltoluenediamine E-100 enter the spray gun to impinge an...

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Abstract

The invention relates to a method for preparing polyurethane-polyurea coated fertilizer, comprising the following steps: dehydrating polyether polyol to obtain dehydrated polyether polyol, adding polyisocyanate to the dehydrated polyether according to the molar ratio of NCO to OH of 2-5, heating the temperature of the mixture of the dehydrated polyether and the polyisocyanate to 70-90 DEG C, making the mixture of the dehydrated polyether and the polyisocyanate react until the mass of NCO being 5-9 percent of the mass of the product of reaction, defoaming the product of reaction in vacuum to obtain -NCO-ended polyurethane prepolymer, filling fertilizer in a spray dryer, heating the fertilizer to 60 DEG C, mixing the polyurethane prepolymer with amine chain extender according to the mass ratio of 7-8:1 to obtain spraying liquid by controlling the fan frequency at 45 Hz, the nozzle atomization air pressure at 0.7-1.2 Mpa, the inlet air temperature at 20-80 DEG C and the spray rate at 0.4-0.6 Kg / h, spraying the spraying liquid whose mass is 7-10 percent of the mass of the fertilizer on to the fertilizer, and curing the coating film to obtain the polyurethane-polyurea coated fertilizer.

Description

Technical field [0001] The invention relates to a preparation method of a coated controlled-release fertilizer, in particular to a preparation method of a coated controlled-release fertilizer using polyurethane polyurea as a coating material. Background technique [0002] Controlled-release fertilizers can change the traditional fertilization methods, simplify the fertilization procedures, and synchronize the sowing and fertilization, thereby greatly reducing agricultural labor intensity and improving labor productivity. Controlled-release fertilizers also have a slow-release and long-acting effect, which can greatly increase fertilizer utilization, save resources at the same yield level of the same crop, reduce fertilizer application, reduce costs, and increase farmers' income. [0003] As a new type of fertilizer, slow-release fertilizer has the characteristics of reducing nutrient loss, improving fertilizer utilization efficiency, and reducing environmental pollution caused by c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G5/00C05G3/00
Inventor 宫涛白贵峰杨树竹李汾王英
Owner 晋盾防护(山西)科技有限公司
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